[Trainer]

Jerry, Plugged into a 30 amp or 20 amp single leg circuit only energizes the 120 vac, 1650 watt, 5000 btu electric element. This element will heat the AH coolant just fine when there is no heat demand. The demand for heat below 50 degrees ambient is more than the 1650 watts can meet for 72 degrees inside. As outside temps go well below freezing, the interior temp in the coach and basement utility areas well drop below freezing too.

Think about heating the coach and basement with one heater from Walmart.

But, with the diesel burner added to the 120 vac, you can live in -30 degree weather. Just be sure to have diesel and house battery power to run the AH heater and fan coils. Inverter charger solves house battery issue as long as grid power is good.

The hot AH coolant is circulated to fan coils throughout the coach and basement to provide hydronic heating.

Hope this helps. Ask more questions till it is clear to you.

The 30 and 20 amp plugs will have to be on two separate legs for you to get 220 vac to energize the 4500 watt 220 electric element. My bet is they are on the same leg leaving only the 120 vac element energized and only 5000 btus of heat available.